stabilize `const_extern_fn` #1596

folkertdev · 2024-08-29T17:12:52Z

This feels a little bare-bones, but I guess that is sort of what the spec is for: just factual statements.

traviscross

This looks right. This is pending the stabilization in:

stabilize const_extern_fn rust#129753

…, r=RalfJung stabilize `const_extern_fn` closes rust-lang#64926 tracking issue: rust-lang#64926 reference PR: rust-lang/reference#1596 ## Stabilizaton Report ### Summary Using `const extern "Rust"` and `const extern "C"` was already stabilized (since version 1.62.0, see rust-lang#95346). This PR stabilizes the other calling conventions: it is now possible to write `const unsafe extern "calling-convention" fn` and `const extern "calling-convention" fn` for any supported calling convention: ```rust const extern "C-unwind" fn foo1(val: u8) -> u8 { val + 1} const extern "stdcall" fn foo2(val: u8) -> u8 { val + 1} const unsafe extern "C-unwind" fn bar1(val: bool) -> bool { !val } const unsafe extern "stdcall" fn bar2(val: bool) -> bool { !val } ``` This can be used to const-ify an `extern fn`, or conversely, to make a `const fn` callable from external code. r? T-lang cc `@RalfJung`

ehuss

Thanks!

stabilize `const_extern_fn` closes rust-lang/rust#64926 tracking issue: rust-lang/rust#64926 reference PR: rust-lang/reference#1596 ## Stabilizaton Report ### Summary Using `const extern "Rust"` and `const extern "C"` was already stabilized (since version 1.62.0, see rust-lang/rust#95346). This PR stabilizes the other calling conventions: it is now possible to write `const unsafe extern "calling-convention" fn` and `const extern "calling-convention" fn` for any supported calling convention: ```rust const extern "C-unwind" fn foo1(val: u8) -> u8 { val + 1} const extern "stdcall" fn foo2(val: u8) -> u8 { val + 1} const unsafe extern "C-unwind" fn bar1(val: bool) -> bool { !val } const unsafe extern "stdcall" fn bar2(val: bool) -> bool { !val } ``` This can be used to const-ify an `extern fn`, or conversely, to make a `const fn` callable from external code. r? T-lang cc `@RalfJung`

Update books ## rust-lang/book 5 commits in e7d217be2a75ef1753f0988d6ccaba4d7e376259..99cf75a5414fa8adbe3974bd0836661ca901708f 2024-09-23 16:18:39 UTC to 2024-09-11 18:38:03 UTC - translations: remove broken link (rust-lang/book#4036) - Update build instructions: include mdbook plugins (rust-lang/book#4032) - Add `cargo init` usage suggestion to 1.3 (rust-lang/book#4025) - Use immutable borrow of `TcpStream` when creating `BufReader` (rust-lang/book#4024) - Upgrade to Rust 1.81 (rust-lang/book#4031) ## rust-lang/edition-guide 1 commits in b3ca7ade0f87d7e3fb538776defc5b2cc4188172..c7ebae25cb4801a31b6f05353f6d85bfa6feedd1 2024-09-22 08:47:02 UTC to 2024-09-22 08:47:02 UTC - Update static_mut_refs now that it is a lint (rust-lang/edition-guide#322) ## rust-lang/reference 10 commits in 687faf9958c52116d003b41dfd29cc1cf44f5311..24fb2687cdbc54fa18ae4acf5d879cfceca77b2c 2024-09-22 09:07:12 UTC to 2024-09-10 19:24:17 UTC - do not talk about the 'address of a constant' (rust-lang/reference#1624) - Add spec identifier syntax to interior-mutability.md (rust-lang/reference#1585) - Add spec identifier syntax to input-format.md (rust-lang/reference#1584) - Document limitations on block doc comments (rust-lang/reference#1602) - Places based on misaligned pointers: also mention 'static's as a possible base for place projections (rust-lang/reference#1606) - type-layout: mention that call ABI compatibility is a separate concern (rust-lang/reference#1608) - stabilize `const_extern_fn` (rust-lang/reference#1596) - const_eval: update for const_mut_refs and const_refs_to_cell stabilization (rust-lang/reference#1590) - fix: unclosed tag `sup` (rust-lang/reference#1612) - Fix improper documentation on casting non_exhaustive enums (rust-lang/reference#1607) ## rust-lang/rustc-dev-guide 13 commits in 0ed9229f5b6f7824b333beabd7e3d5ba4b9bd971..555f3de2fa0d61c4294b74d245f1cbad6fcbf589 2024-09-23 12:51:33 UTC to 2024-09-10 07:32:10 UTC - chore: add missing `.` (rust-lang/rustc-dev-guide#2074) - Add remark on required free disk space (rust-lang/rustc-dev-guide#2073) - fix broken links (rust-lang/rustc-dev-guide#2063) - Add advice about submitting potentially hard-to-review PRs (rust-lang/rustc-dev-guide#2036) - Edit a sentence for clarity (rust-lang/rustc-dev-guide#2071) - Emphasize how to run a single tool test (rust-lang/rustc-dev-guide#2070) - Remove chalk is owned by WG-traits (rust-lang/rustc-dev-guide#2068) - Fix conditions lowering text for enums with no fields (rust-lang/rustc-dev-guide#2066) - update proof tree chapter (rust-lang/rustc-dev-guide#2054) - Add docs for JS tests (rust-lang/rustc-dev-guide#2048) - Reflect `x.py test`'s `--rustc-args` option being renamed to `--compiletest-rustc-args` (rust-lang/rustc-dev-guide#2062) - we standardized on this more reliable command (rust-lang/rustc-dev-guide#2061) - Fix Typo and Remove Outdated Line About C Variadics (rust-lang/rustc-dev-guide#2060)

Rollup merge of rust-lang#130759 - rustbot:docs-update, r=ehuss Update books ## rust-lang/book 5 commits in e7d217be2a75ef1753f0988d6ccaba4d7e376259..99cf75a5414fa8adbe3974bd0836661ca901708f 2024-09-23 16:18:39 UTC to 2024-09-11 18:38:03 UTC - translations: remove broken link (rust-lang/book#4036) - Update build instructions: include mdbook plugins (rust-lang/book#4032) - Add `cargo init` usage suggestion to 1.3 (rust-lang/book#4025) - Use immutable borrow of `TcpStream` when creating `BufReader` (rust-lang/book#4024) - Upgrade to Rust 1.81 (rust-lang/book#4031) ## rust-lang/edition-guide 1 commits in b3ca7ade0f87d7e3fb538776defc5b2cc4188172..c7ebae25cb4801a31b6f05353f6d85bfa6feedd1 2024-09-22 08:47:02 UTC to 2024-09-22 08:47:02 UTC - Update static_mut_refs now that it is a lint (rust-lang/edition-guide#322) ## rust-lang/reference 10 commits in 687faf9958c52116d003b41dfd29cc1cf44f5311..24fb2687cdbc54fa18ae4acf5d879cfceca77b2c 2024-09-22 09:07:12 UTC to 2024-09-10 19:24:17 UTC - do not talk about the 'address of a constant' (rust-lang/reference#1624) - Add spec identifier syntax to interior-mutability.md (rust-lang/reference#1585) - Add spec identifier syntax to input-format.md (rust-lang/reference#1584) - Document limitations on block doc comments (rust-lang/reference#1602) - Places based on misaligned pointers: also mention 'static's as a possible base for place projections (rust-lang/reference#1606) - type-layout: mention that call ABI compatibility is a separate concern (rust-lang/reference#1608) - stabilize `const_extern_fn` (rust-lang/reference#1596) - const_eval: update for const_mut_refs and const_refs_to_cell stabilization (rust-lang/reference#1590) - fix: unclosed tag `sup` (rust-lang/reference#1612) - Fix improper documentation on casting non_exhaustive enums (rust-lang/reference#1607) ## rust-lang/rustc-dev-guide 13 commits in 0ed9229f5b6f7824b333beabd7e3d5ba4b9bd971..555f3de2fa0d61c4294b74d245f1cbad6fcbf589 2024-09-23 12:51:33 UTC to 2024-09-10 07:32:10 UTC - chore: add missing `.` (rust-lang/rustc-dev-guide#2074) - Add remark on required free disk space (rust-lang/rustc-dev-guide#2073) - fix broken links (rust-lang/rustc-dev-guide#2063) - Add advice about submitting potentially hard-to-review PRs (rust-lang/rustc-dev-guide#2036) - Edit a sentence for clarity (rust-lang/rustc-dev-guide#2071) - Emphasize how to run a single tool test (rust-lang/rustc-dev-guide#2070) - Remove chalk is owned by WG-traits (rust-lang/rustc-dev-guide#2068) - Fix conditions lowering text for enums with no fields (rust-lang/rustc-dev-guide#2066) - update proof tree chapter (rust-lang/rustc-dev-guide#2054) - Add docs for JS tests (rust-lang/rustc-dev-guide#2048) - Reflect `x.py test`'s `--rustc-args` option being renamed to `--compiletest-rustc-args` (rust-lang/rustc-dev-guide#2062) - we standardized on this more reliable command (rust-lang/rustc-dev-guide#2061) - Fix Typo and Remove Outdated Line About C Variadics (rust-lang/rustc-dev-guide#2060)

Update books ## rust-lang/book 5 commits in e7d217be2a75ef1753f0988d6ccaba4d7e376259..99cf75a5414fa8adbe3974bd0836661ca901708f 2024-09-23 16:18:39 UTC to 2024-09-11 18:38:03 UTC - translations: remove broken link (rust-lang/book#4036) - Update build instructions: include mdbook plugins (rust-lang/book#4032) - Add `cargo init` usage suggestion to 1.3 (rust-lang/book#4025) - Use immutable borrow of `TcpStream` when creating `BufReader` (rust-lang/book#4024) - Upgrade to Rust 1.81 (rust-lang/book#4031) ## rust-lang/edition-guide 1 commits in b3ca7ade0f87d7e3fb538776defc5b2cc4188172..c7ebae25cb4801a31b6f05353f6d85bfa6feedd1 2024-09-22 08:47:02 UTC to 2024-09-22 08:47:02 UTC - Update static_mut_refs now that it is a lint (rust-lang/edition-guide#322) ## rust-lang/reference 10 commits in 687faf9958c52116d003b41dfd29cc1cf44f5311..24fb2687cdbc54fa18ae4acf5d879cfceca77b2c 2024-09-22 09:07:12 UTC to 2024-09-10 19:24:17 UTC - do not talk about the 'address of a constant' (rust-lang/reference#1624) - Add spec identifier syntax to interior-mutability.md (rust-lang/reference#1585) - Add spec identifier syntax to input-format.md (rust-lang/reference#1584) - Document limitations on block doc comments (rust-lang/reference#1602) - Places based on misaligned pointers: also mention 'static's as a possible base for place projections (rust-lang/reference#1606) - type-layout: mention that call ABI compatibility is a separate concern (rust-lang/reference#1608) - stabilize `const_extern_fn` (rust-lang/reference#1596) - const_eval: update for const_mut_refs and const_refs_to_cell stabilization (rust-lang/reference#1590) - fix: unclosed tag `sup` (rust-lang/reference#1612) - Fix improper documentation on casting non_exhaustive enums (rust-lang/reference#1607) ## rust-lang/rustc-dev-guide 13 commits in 0ed9229f5b6f7824b333beabd7e3d5ba4b9bd971..555f3de2fa0d61c4294b74d245f1cbad6fcbf589 2024-09-23 12:51:33 UTC to 2024-09-10 07:32:10 UTC - chore: add missing `.` (rust-lang/rustc-dev-guide#2074) - Add remark on required free disk space (rust-lang/rustc-dev-guide#2073) - fix broken links (rust-lang/rustc-dev-guide#2063) - Add advice about submitting potentially hard-to-review PRs (rust-lang/rustc-dev-guide#2036) - Edit a sentence for clarity (rust-lang/rustc-dev-guide#2071) - Emphasize how to run a single tool test (rust-lang/rustc-dev-guide#2070) - Remove chalk is owned by WG-traits (rust-lang/rustc-dev-guide#2068) - Fix conditions lowering text for enums with no fields (rust-lang/rustc-dev-guide#2066) - update proof tree chapter (rust-lang/rustc-dev-guide#2054) - Add docs for JS tests (rust-lang/rustc-dev-guide#2048) - Reflect `x.py test`'s `--rustc-args` option being renamed to `--compiletest-rustc-args` (rust-lang/rustc-dev-guide#2062) - we standardized on this more reliable command (rust-lang/rustc-dev-guide#2061) - Fix Typo and Remove Outdated Line About C Variadics (rust-lang/rustc-dev-guide#2060)

stabilize const_extern_fn

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folkertdev mentioned this pull request Aug 29, 2024

stabilize const_extern_fn rust-lang/rust#129753

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ehuss added the S-waiting-on-stabilization Waiting for a stabilization PR to be merged in the main Rust repository label Sep 3, 2024

traviscross approved these changes Sep 3, 2024

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ehuss approved these changes Sep 15, 2024

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ehuss added this pull request to the merge queue Sep 15, 2024

Merged via the queue into rust-lang:master with commit e271d9c Sep 15, 2024
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rustbot mentioned this pull request Sep 23, 2024

Update books rust-lang/rust#130759

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stabilize `const_extern_fn` #1596

stabilize `const_extern_fn` #1596

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stabilize const_extern_fn #1596

stabilize const_extern_fn #1596

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stabilize `const_extern_fn` #1596

stabilize `const_extern_fn` #1596